:root {
  --bg: #f4f1ea;
  --ink: #151515;
  --muted: #777064;
  --line: #c9c1b5;
  --paper: #fffaf0;
  --accent: #222;
}

* { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Noto Sans Mono CJK JP", monospace;
  line-height: 1.65;
}

a {
  color: inherit;
  text-decoration: none;
}

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 10;
  display: grid;
  grid-template-columns: 1fr auto auto;
  gap: 28px;
  align-items: center;
  padding: 18px 28px;
  border-bottom: 1px solid var(--line);
  background: rgba(244, 241, 234, 0.9);
  backdrop-filter: blur(10px);
}

.site-title {
  font-size: 14px;
  letter-spacing: 0.08em;
}

.site-nav {
  display: flex;
  gap: 18px;
  font-size: 13px;
}

.lang-switch {
  display: flex;
  border: 1px solid var(--ink);
}

.lang-switch a {
  padding: 3px 8px;
  font-size: 12px;
}

.lang-switch a.active {
  background: var(--ink);
  color: var(--bg);
}

.hero {
  min-height: 90vh;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  padding: 130px 28px 70px;
  border-bottom: 1px solid var(--line);
}

.eyebrow {
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.16em;
  font-size: 12px;
}

h1 {
  margin: 0;
  font-size: clamp(58px, 11vw, 160px);
  line-height: 0.88;
  letter-spacing: -0.07em;
  font-weight: 500;
}

.lead {
  max-width: 720px;
  margin-top: 42px;
  font-size: clamp(18px, 2.2vw, 28px);
}

.section {
  padding: 90px 28px;
  border-bottom: 1px solid var(--line);
}

.section-head {
  display: grid;
  grid-template-columns: 60px 1fr;
  align-items: baseline;
  margin-bottom: 48px;
}

.section-head span {
  color: var(--muted);
  font-size: 13px;
}

h2 {
  margin: 0;
  font-size: clamp(34px, 6vw, 78px);
  line-height: 1;
  font-weight: 500;
  letter-spacing: -0.04em;
}

h3 {
  margin: 0 0 14px;
  font-size: 20px;
  font-weight: 500;
}

.text-block {
  max-width: 880px;
}

.text-block p {
  margin: 0 0 1.4em;
}

.research-grid {
  display: grid;
  grid-template-columns: minmax(0, 0.8fr) minmax(320px, 1.2fr);
  gap: 42px;
  align-items: stretch;
}

.research-map {
  position: relative;
  min-height: 440px;
  border: 1px solid var(--ink);
  background:
    linear-gradient(to right, transparent 49.8%, var(--line) 50%, transparent 50.2%),
    linear-gradient(to top, transparent 49.8%, var(--line) 50%, transparent 50.2%);
  padding: 34px;
}

.axis {
  position: absolute;
  color: var(--muted);
  font-size: 11px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.axis-y {
  top: 16px;
  left: 16px;
  writing-mode: vertical-rl;
}

.axis-x {
  right: 16px;
  bottom: 16px;
}

.map-layer {
  position: absolute;
  left: 18%;
  right: 18%;
  padding: 10px 14px;
  border: 1px solid var(--ink);
  background: var(--paper);
  font-size: 13px;
}

.layer-5 { top: 12%; transform: translateX(-8%); }
.layer-4 { top: 27%; transform: translateX(6%); }
.layer-3 { top: 42%; transform: translateX(-2%); }
.layer-2 { top: 57%; transform: translateX(10%); }
.layer-1 { top: 72%; transform: translateX(-5%); }

.map-layer.active {
  background: var(--ink);
  color: var(--bg);
}

.scope-left,
.scope-right {
  position: absolute;
  bottom: 16px;
  font-size: 11px;
  color: var(--muted);
}

.scope-left { left: 34px; }
.scope-right { right: 34px; }

.text-link {
  display: inline-block;
  margin-top: 12px;
  border-bottom: 1px solid currentColor;
}

.filter-buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 28px;
}

.filter-buttons button,
.admin-button {
  border: 1px solid var(--ink);
  background: transparent;
  color: var(--ink);
  padding: 7px 12px;
  font: inherit;
  cursor: pointer;
}

.filter-buttons button.active,
.admin-button {
  background: var(--ink);
  color: var(--bg);
}

.works-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  border-top: 1px solid var(--line);
}

.work-card {
  padding: 28px 0;
  border-bottom: 1px solid var(--line);
}

.work-card:nth-child(odd) {
  padding-right: 24px;
  border-right: 1px solid var(--line);
}

.work-card:nth-child(even) {
  padding-left: 24px;
}

.work-card img,
.member-card img {
  width: 100%;
  display: block;
  margin-bottom: 18px;
  border: 1px solid var(--line);
}

.work-meta {
  display: flex;
  gap: 16px;
  color: var(--muted);
  font-size: 12px;
  margin-bottom: 10px;
}

.material {
  color: var(--muted);
  font-size: 13px;
}

.embed iframe {
  max-width: 100%;
}

.member-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 28px;
}

.member-card {
  border: 1px solid var(--line);
  padding: 22px;
  background: rgba(255, 250, 240, 0.35);
}

.role {
  color: var(--muted);
}

.member-links,
.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  font-size: 13px;
}

.member-links a,
.footer-links a {
  border-bottom: 1px solid currentColor;
}

.site-footer {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 28px;
  padding: 42px 28px 70px;
  color: var(--muted);
  font-size: 13px;
}

.lang {
  display: none;
}

body[data-lang="ja"] .lang-ja,
body[data-lang="en"] .lang-en {
  display: block;
}

@media (max-width: 760px) {
  .site-header {
    grid-template-columns: 1fr auto;
    gap: 12px;
  }

  .site-nav {
    grid-column: 1 / -1;
    overflow-x: auto;
    padding-bottom: 2px;
  }

  .research-grid,
  .works-list,
  .member-list,
  .site-footer {
    grid-template-columns: 1fr;
  }

  .work-card:nth-child(odd),
  .work-card:nth-child(even) {
    padding-left: 0;
    padding-right: 0;
    border-right: 0;
  }

  .hero {
    padding-top: 150px;
  }
}